1. NASA/GSFC (United States)
2. National Optical Astronomy Observatories/Kitt Peak National Observatory (United States)
3. Dominion Astrophysical Observatory (United States)
4. Princeton University (United States)
5. Joint Institute for Laboratory Astrophysics (United States)
6. Johns Hopkins University (United States)
7. University of Wisconsin (United States)
8. Lockheed Palo Alto Research Laboratory (United States)
9. Stanford University (United States)
10. Applied Research Corporation (United States)
11. Ball Aerospace Systems Division (United States)